US2024264419A1PendingUtilityA1
Zoom lens and image pickup apparatus
Est. expiryFeb 6, 2043(~16.5 yrs left)· nominal 20-yr term from priority
Inventors:Kohei Kimura
G02B 27/646G02B 15/16G02B 15/1461G02B 15/1451G02B 15/1441G02B 15/1431G02B 15/143105G02B 13/02G02B 13/005
58
PatentIndex Score
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Cited by
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References
0
Claims
Abstract
A zoom lens includes a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a rear group consisting of one or more lens units. A distance between adjacent lens units changes during zooming, and the second lens unit does not move for zooming. At least a part of the second lens unit moves in a direction including a component orthogonal to an optical axis during image stabilization. A lens disposed closest to an object in the second lens unit has positive refractive power. A predetermined inequality is satisfied.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A zoom lens comprising a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side:
a first lens unit having positive refractive power; a second lens unit having negative refractive power; and a rear group consisting of one or more lens units, wherein a distance between adjacent lens units changes during zooming, and the second lens unit does not move for zooming, wherein at least a part of the second lens unit moves in a direction including a component orthogonal to an optical axis during image stabilization, wherein a lens disposed closest to an object in the second lens unit has positive refractive power, and wherein the following inequality is satisfied:
0
.
0
0
3
<
D2
/
ft
<
0
.
0
2
6
where D2 is a distance on an optical axis from a lens surface closest to an object of the second lens unit to a lens surface closest to an image plane of the second lens unit, and ft is a focal length of the zoom lens at a telephoto end.
2 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
-
1.
<
f
2
/
fw
<
-
0.2
where f2 is a focal length of the second lens unit.
3 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
3.
0
<
D
1
/
D
2
<
3
0
.
0
where D1 is a distance on an optical axis from a lens surface closest to an object of the first lens unit to a lens surface closest to an image plane of the first lens unit.
4 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
3.
<
T
D
12
t
/
TG
12
<
1
5
where TD12t is a distance from a lens surface closest to the object of the first lens unit to a lens surface closest to an image plane of the second lens unit at the telephoto end, and TG12 is a sum of lens thicknesses on the optical axis of the first lens unit and the second lens unit.
5 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
1.
0
0
<
ft
/
TTDw
<
3.5
where TTDw is an overall optical length from a lens surface closest to the object of the zoom lens to an image plane at a wide-angle end.
6 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
8.
0
<
ft
/
skw
<
35.
where skw is a back focus of the zoom lens at a wide-angle end.
7 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
5
<
T
TDw
/
skw
<
2
0
where TTDw is an optical overall length from a lens surface closest to the object of the zoom lens at a wide-angle end to an image plane, and skw is a back focus of the zoom lens at the wide-angle end.
8 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
0
.
1
0
<
m
1
/
f
1
<
0.5
where m1 is a moving amount of the first lens unit during zooming from a wide-angle end to the telephoto end, and f1 is a focal length of the first lens unit.
9 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
1.
<
f
1
/
fw
<
3.
where fw is a focal length at a wide-angle end, and f1 is a focal length of the first lens unit.
10 . The zoom lens according to claim 1 , wherein the following inequality is satisfied:
-
6
.
0
<
(
1
-
β
ist
)
β
rt
<
-
2.
where βist is a lateral magnification of an image stabilizing lens unit that performs the image stabilization among the second lens unit at the telephoto end, and βrt is a combined lateral magnification of all lens units on the image side of the image stabilizing lens unit at the telephoto end.
11 . The zoom lens according to claim 1 , wherein the rear group includes a focus lens unit that moves during focusing, and
wherein the following inequality is satisfied:
4.
<
❘
"\[LeftBracketingBar]"
(
1
-
β
ft
2
)
β
rt
2
❘
"\[RightBracketingBar]"
<
20.
where βft is a lateral magnification of the focus lens unit at the telephoto end, and βrt is a combined lateral magnification of all lens units on the image side of the focus lens unit at the telephoto end.
12 . The zoom lens according to claim 1 , wherein the first lens unit consists of, in order from the object side to the image side, a set of lenses having positive, positive, and negative refractive powers.
13 . The zoom lens according to claim 1 , wherein the second lens unit consists of, in order from the object side to the image side, a set of lenses having positive, negative, and negative refractive powers, and
wherein the second lens unit wholly serves as an image stabilizing lens unit that performs the image stabilization.
14 . The zoom lens according to claim 1 , wherein the rear group consists of a third lens unit having positive refractive power, a fourth lens unit having positive refractive power, a fifth lens unit having negative refractive power, and a sixth lens unit having negative refractive power.
15 . The zoom lens according to claim 1 , further comprising an aperture stop disposed in or on the image side of a third lens unit included in the rear group.
16 . The zoom lens according to claim 1 , wherein all lenses in the zoom lens are spherical lenses.
17 . An image pickup apparatus comprising:
a zoom lens; and an image sensor configured to receive an image formed by the zoom lens, wherein the zoom lens includes a plurality of lens units, the plurality of lens units consisting of, in order from an object side to an image side: a first lens unit having positive refractive power; a second lens unit having negative refractive power; and a rear group consisting of one or more lens units, wherein a distance between adjacent lens units changes during zooming, and the second lens unit does not move for zooming, wherein at least a part of the second lens unit moves in a direction including a component orthogonal to an optical axis during image stabilization, wherein a lens disposed closest to an object in the second lens unit has positive refractive power, and wherein the following inequality is satisfied:
0
.
0
0
3
<
D2
/
ft
<
0
.
0
2
6
where D2 is a distance on an optical axis from a lens surface closest to an object of the second lens unit to a lens surface closest to an image plane of the second lens unit, and ft is a focal length of the zoom lens at a telephoto end.Join the waitlist — get patent alerts
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